2tr in corner dtr

[Laure]

Hi!
im having trouble with the below pattern for a lovey blanket worked in a round. Specifically, at the end of round 2 when it asks you to place two tr into the corner dtr. Where is this stitch? I don’t seem to have a stitch available, only the space between my initial chain 4 and the post of the first treble from the previous round. 
 

Rnd 2: ch 4, work 2 tr in corner dtr, [tr in next 4 sts, (2 tr, dtr, 2 tr) in corner dtr} x3, tr in next 4 sts.  Work 2 tr into first corner dtr to finish.  Join round with a sl-st into top of beg ch 4. (36 sts)

[bgs]

The last 2 tr would be worked into the same dtr as your first 2 tr.

Note that it says (2 tr, dtr, 2tr) in corner.  You started this round with  part of a corner (2 tr, dtr).  You finish the corner when you get back around with 2 tr.